Mathf.Deg2Rad  

// convert 30 degrees to radians

var deg : float = 30.0;

function Start() {
var rad : float = deg * Mathf.Deg2Rad;
Debug.Log(deg + "degrees are equal to " + rad + " radians.");
}

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
public float deg = 30.0F;
void Start() {
float rad = deg * Mathf.Deg2Rad;
Debug.Log(deg + "degrees are equal to " + rad + " radians.");
}
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

public deg as single = 30.0F

def Start():
rad as single = (deg * Mathf.Deg2Rad)
Debug.Log((((deg + 'degrees are equal to ') + rad) + ' radians.'))